PRESSURE SENSITIVE COATING FOR IMAGE FORMING
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United States of America Patent
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Issued Date -
Sep 5, 2013
app pub date -
Mar 1, 2013
filing date -
Mar 1, 2012
priority date (Note) -
Abandoned
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Abstract
Dye and developer components of a leuco dye system are separately microencapsulated. The microcapsule walls are fragile to the point of being easily ruptured. The microcapsules are mixed combined into a coating composition that is applied to a substrate and dried. Forces applied to the substrate, such as by the application of fingers or a writing instrument, rupture the capsule to produce a color change by interaction of the leuco dye system components that are released upon rupture of the capsules.
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